#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>

int port = 6789;

int main() {
    int sin_len;
    char message[256];
    int socket_descriptor;
    struct sockaddr_in sin;
    printf("Waiting for data from sender\n");
/*
    Initialize socket address structure for Internet Protocols
*/
    bzero(&sin, sizeof(sin)); /* empty data structure */
    sin.sin_family = AF_INET;
    sin.sin_addr.s_addr = htonl(INADDR_ANY);
    sin.sin_port = htons(port);
    sin_len = sizeof(sin);
/*
    Create a UDP socket
    and bind it to the port
*/
    socket_descriptor = socket(AF_INET, SOCK_DGRAM, 0);
    bind(socket_descriptor, (struct sockaddr *)&sin, sizeof(sin));
/*
    Loop forever (or until a termination message is received)
    Eeceive data through the socket and process it. The processing
    in this progaram is really simple -- printing.
*/
    while(1)
    {
       recvfrom(socket_descriptor, message, sizeof(message), 0,
		(struct sockaddr *)&sin, &sin_len);
       printf("Response from server:%s\n", message);
       if (strncmp(message, "stop", 4) == 0)
       {
          printf("Sender has told me to end the connection\n");
	  break;
       }
    }
    close(socket_descriptor);
    exit(EXIT_SUCCESS);
}
